JM
John Mccarthy — 1940 US Census Record
Model Tree available1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this John Mccarthy across the 1920, 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Mary — first a son (b.~1897), then head of a 5-person household.
Age 43
b. ~1897
Male
Son
Born: New Hampshire
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | McCarthy |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 43 |
| Marital Status | Single |
| Birthplace | New Hampshire |
| 1935 Residence (City) | Chelsea City |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Occupation | Painter |
| Industry | Building |
| Class of Worker | PW |
| Hours Worked | 24 |
| Income (1939) | 340 |
| Highest Grade | 7 |
| 1935 Residence | Same Place |
| Birth State | New Hampshire |
| Birth Country | United States |
| Birthplace (normalized) | new hampshire |
| Occupation | Painter |
| Township / Ward | Chelsea City |
| Est. Birth Year | ~1897 |
Household Members
Census records only state relationship to the household head.
Pairwise kinship is derived (~90–95% accurate), not recorded.
Step/blended families and boarders can break it.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Mary Mccarthy | Head | — | 77 | ~1863 |
| June Cassidy | Other | — | 11 | ~1929 |
| John Mccarthy | Son | — | 43 | ~1897 |
| Justin Mccarthy | Son | — | 48 | ~1892 |
| Florence Mccarthy | Son | — | 51 | ~1889 |
Census Appearances
1920
Suffolk, Massachusetts
Son, age 22
Suffolk, Massachusetts · implied b. ~1898 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCarthy |
| Given Name | John J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | New Hampshire |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Sailor |
| Industry | Merchant ship |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Irish |
| Birth State | New Hampshire |
| Birth Country | United States |
| Birthplace (normalized) | new hampshire |
1930
Suffolk, Massachusetts
Son, age 30
Suffolk, Massachusetts · implied b. ~1900 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McCarthy |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | New Hampshire |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Canada French |
| Occupation | Laborer |
| Industry | Landscape Gardening |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | New Hampshire |
| Birth Country | United States |
| Birthplace (normalized) | new hampshire |
1940
Suffolk-County, Massachusetts
Son, age 43
Suffolk-County, Massachusetts · implied b. ~1897 — 5 household members
| Surname | McCarthy |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 43 |
| Marital Status | Single |
| Birthplace | New Hampshire |
| 1935 Residence (City) | Chelsea City |
| 1935 Residence (County) | Suffolk |
| Occupation | Painter |
| Industry | Building |
| Class of Worker | PW |
| Hours Worked | 24 |
| Income (1939) | 340 |
| Highest Grade | 7 |
| 1935 Residence | Same Place |
| Birth State | New Hampshire |
| Birth Country | United States |
| Birthplace (normalized) | new hampshire |
Model Tree
An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Our Model Tree links John Mccarthy across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Mary Mccarthy (~0.92 confidence). The pedigree spans 1 generation with 1 identified ancestor.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Mary Mccarthy
b. ~1863
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Mccarthy
Son · 1940 · age 43 · b. ~1897 · Massachusetts
★ You are viewing this record
Sibling
Justin Mccarthy
Sibling · 1940 · age 48
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Florence Mccarthy
Sibling · 1940 · age 51
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Suffolk-County, Massachusetts
Open full size
1940 US Federal Census — Suffolk-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01641-00152)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Joseph Santo | 38 | Head | Baker | Italy |
| 2 | Rose Santo | 37 | Wife | — | Massachusetts |
| 3 | Mary Santo | 9 | Daughter | — | Massachusetts |
| 4 | Rita Santo | 7 | Daughter | — | Massachusetts |
| 5 | Adeline Santo | 5 | Daughter | — | Massachusetts |
| 6 | Joseph Santo | 2 | Son | — | Massachusetts |
| 7 | Angelo Santagate | 41 | Head | Truck Driver | Italy |
| 8 | Rosario Santagate | 34 | Wife | — | Italy |
| 9 | Gaetano Santagate | 15 | Son | — | Massachusetts |
| 10 | Concetina Santagate | 12 | Daughter | — | Massachusetts |
| 11 | Thomas Santagate | 11 | Son | — | Massachusetts |
| 12 | Mary Santagate | 6 | Daughter | — | Massachusetts |
| 13 | Theresa Santagate | 4 | Son | — | Massachusetts |
| 14 | Domenic Borrino | 67 | Head | Pressman | Italy |
| 15 | Mildred Borrino | 24 | Daughter | — | Massachusetts |
| 16 | Edward Dale | 75 | Head | — | Canada-English |
| 17 | Catherine Dale | 60 | Wife | — | Canada-English |
| 18 | Mary Mccarthy | 77 | Head | — | Ireland |
| 19 | Florence Mccarthy | 51 | Son | Fire Attendant | Maine |
| 20 | Justin Mccarthy | 48 | Son | Laborer | New Hampshire |
| 21 | John Mccarthy THIS PERSON | 43 | Son | Painter | New Hampshire |
| 22 | June Cassidy | 11 | Grand-daughter | — | Massachusetts |
| 23 | Anna Eminent | 39 | Head | Maid | New Hampshire |
| 24 | Leo Eminent | 15 | Son | — | Rhode Island |
| 25 | Robert Eminent | 13 | Son | — | Massachusetts |
| 26 | Lillian Laskey | 40 | Head | — | Massachusetts |
| 27 | Ruth Laskey | 24 | Daughter | Receptionist | Massachusetts |
| 28 | Charles Laskey | 22 | Son | Longshoreman | Massachusetts |
| 29 | Lillian Laskey | 21 | Daughter | Inspector | Massachusetts |
| 30 | Florence Laskey | 17 | Daughter | Stenographer | Massachusetts |
| 31 | Edward Laskey | 13 | Son | — | Massachusetts |
| 32 | Josephine Delizio | 34 | Head | — | Massachusetts |
| 33 | Mary Rice | 68 | Mother-in-law | — | Massachusetts |
| 34 | Oliver Rice | 32 | Brother | Laborer | Massachusetts |
| 35 | John Borkowski | 36 | Head | Truck Driver | Poland |
| 36 | Lena Borkowski | 31 | Wife | — | Rhode Island |
| 37 | Barbara Borkowski | 3 | Daughter | — | Massachusetts |
| 38 | John Barrett | 47 | Head | Letter Carrier | Massachusetts |
| 39 | Johanna Barrett | 63 | Mother | — | Massachusetts |
| 40 | Edward Harris | 65 | Head | Bar Tender | Massachusetts |
Pedigree Summary
John + 2 siblings
Gen 1 · 1 parents
~0.92
Max depth 4 (1900–1950 window)
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.
Source: National Archives and Records Administration (NARA)